Skin Discoloration

My 8 year old son had extremely dry skin on his hands; almost as if he was wearing "gloves". I started treating his hands with vaseline and then lotion and his hands are now soft and back to normal but now his hands look like he is wearing gloves again. His skin from above his wrist bone all the way to the tips of his fingers is a lighter color than the rest of his body. What is this?

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